A GIS modelling framework to evaluate marine spatial planning scenarios: Co-location of offshore wind farms and aquaculture in the German EEZ     

《Marine Policy》2015

The concept of co-location of marine areas receives an increased significance in the light of sustainable development in the already heavily used offshore marine realm. Within this study, different spatial co-location scenarios for the coupling of offshore aquacultures and wind farms are evaluated in order to support efficient and sustainable marine spatial management strategies. A Geographic Information System (GIS) and multi-criteria evaluation (MCE) techniques were combined to index suitable co-sites in the German exclusive economic zone of the North Sea. The MCE was based on criteria such as temperature, salinity or oxygen. In total, 13 possible aquaculture candidates (seaweed, bivalves, fish and crustaceans) were selected for the scenario configuration. The GIS modelling framework proved to be powerful in defining potential co-location sites. The aquaculture candidate oarweed (Laminaria digitata) revealed the highest suitability scores at 10–20 m depth from April to June, followed by haddock (Melanogrammus aeglefinus) at 20–30 m depth and dulse (Palmaria palmata) and Sea belt (Saccharina latissima) at 0–10 m depth between April and June. In summary, results showed several wind farms were de facto suitable sites for aquaculture since they exhibited high suitability scores for Integrated Multi-Trophic Aquaculture (IMTA) systems combining fish species, bivalves and seaweeds. The present results illustrate how synergies may be realised between competing needs of both offshore wind energy and offshore IMTA in the German EEZ of the North Sea. This might offer guidance to stakeholders and assist decision-makers in determining the most suitable sites for pilot projects using IMTA techniques.  相似文献   

贡山独龙江地区锡钨矿找矿前景   总被引：1，自引：0，他引：1  

张宗勇 《云南地质》2011,30(1):28-31

贡山县独龙江地区,基础地质工作已发现多处物化探异常,认为该区具有形成和赋存锡钨矿床的地质条件,而与南段腾冲、梁河等地相似,极具寻找锡钨多金属矿潜力。  相似文献   

基于克隆选择算法的冲压工艺机器人结构优化研究     

李长江  刘海涛  薛琴  王贵 《广东海洋大学学报》2014,(4):84-90

冲压上下料机器人的结构优化设计,通常涉及多个优化参数,采用传统的优化方法往往由于优化目标函数的复杂性不能得到理想的效果。提出基于克隆选择算法的机器人本体结构优化方法,依托有限元ANSYS Workbench平台得到上下料机器人关键零部件的全局最优本体结构。通过与ANSYS Workbench自带优化算法的比较可知:在不增加结构质量的情况下,能获得更高的刚度和强度,从而有效提高机器人的机械性能。实验测试证明了该方法有效可行。  相似文献   

Differences in habitat selection of male and female megrim (Lepidorhombus whiffiagonis, Walbaum) to the west of Ireland. A result of differences in life-history strategies between the sexes?     

H.D. Gerritsen  D. McGrath  C. Lordan  X. Harlay 《Journal of Sea Research》2010,64(4):487-493

The sex ratio in the catches of megrim (Lepidorhombus whiffiagonis, Walbaum) varied systematically with depth on three independent trawl survey series off the west coast of Ireland. Female megrim dominated the shallow catches, while males were more common in catches from deeper waters. The size difference between the sexes alone cannot explain this pattern because it remained evident when fish length was taken into account. Therefore size-specific habitat preferences or size-selective fishing mortality cannot fully explain the observed trend in the sex ratio of megrim. Female megrim grow to a larger size, at a faster rate than males and it is likely that their differences in habitat preferences are related to this. Shallower waters are warmer during the growing season and are likely to provide better conditions for fast growth. An understanding of the mechanisms behind these patterns is an important consideration in the management and conservation of this fish stock, which might be particularly vulnerable because the commercial landings are to a large extent dominated by female megrim.  相似文献   

Probability of correct selection from lognormal and convective diffusion models based on the likelihood ratio   总被引：1，自引：0，他引：1  

W. G. Strupczewski  H. T. Mitosek  K. Kochanek  V. P. Singh  S. Weglarczyk 《Stochastic Environmental Research and Risk Assessment (SERRA)》2006,20(3):152-163

The objective of the paper is to show that the use of a discrimination procedure for selecting a flood frequency model without the knowledge of its performance for the considered underlying distributions may lead to erroneous conclusions. The problem considered is one of choosing between lognormal (LN) and convective diffusion (CD) distributions for a given random sample of flood observations. The probability density functions of these distributions are similarly shaped in the range of the main probability mass and the discrepancies grow with the increase in the value of the coefficient of variation (C _V ). This problem was addressed using the likelihood ratio (LR) procedure. Simulation experiments were performed to determine the probability of correct selection (PCS) for the LR method. Pseudo-random samples were generated for several combinations of sample sizes and the coefficient of variation values from each of the two distributions. Surprisingly, the PCS of the LN model was twice smaller than that of the CD model, rarely exceeding 50%. The results obtained from simulation were analyzed and compared both with those obtained using real data and with the results obtained from another selection procedure known as the QK method. The results from the QK are just the opposite to that of the LR procedure.  相似文献   

琅玡山抽水蓄能电站厂房位置及轴线方向的优化选择   总被引：1，自引：1，他引：1  

李锦飞 《工程地质学报》2003,11(4):416-420

地下厂房位置及轴线方向的选择是一项重要的地质工作,本文在分析琅山抽水蓄能电站厂房区工程地质条件的基础上,就厂房位置及其轴线方向的优化选择,进行了分析和研究。  相似文献   

测氡仪器工作状态选取浅析     

张清秀  黄晓华 《福建地震》1999,(4)

在仪器标定检查工作中,常常会涉及到工作状态的选取问题。工作状态选取是否合适,将直接影响着观测数据的准确性。本文仅介绍笔者在工作中遇到的几种异常情况及通过实验识别仪器正常与否的方法。笔者深感在台站仪器老化日异严重的今天,认真识别仪器性能是否正常的重要性。  相似文献   

论计算机不间断电源系统     

杨成林  朱海燕  杨孝宇 《福建地震》1998,(4)

本文讨论了计算机不间断电源系统的原理、性能及其发展趋势,并对计算机不间断电源系统的选型和维护作了探讨。  相似文献   

主成分分析技术在遥感蚀变信息提取中的应用研究综述   总被引：1，自引：0，他引：1  

吴志春  叶发旺  郭福生  刘文恒  李华亮  杨羿 《地球信息科学学报》2018,20(11):1644-1656

主成分分析是目前遥感蚀变异常信息提取常用方法之一,该方法具有对影像大气校正质量要求不高、实现简单、提取效果好、效果稳健等优点,广受地质工作者的青睐。根据输入影像的数量及类型、主成分分析的次数等,本文将主成分分析分为标准主成分分析、特征向量主成分分析、定向主成分分析、二次主成分分析、不同影像间的主成分分析等5种类型。其中,特征向量主成分分析又可细分为4个波段特征向量主成分分析和3个波段特征向量主成分分析。在上述分类的基础上,系统介绍了各种主成分分析及蚀变信息主分量的选择,尤其是对特征向量主成分分析的Crosta技术和定向主成分分析的软落叶技术进行了详细阐述。并以TM/ETM+、ASTER影像为例,对部分应用主成分分析提取蚀变异常信息的实例进行了分析,认为：在基岩裸露区,不同主成分分析都可以很好地提取铁化、泥化蚀变信息;在中、低植被覆盖区,采用标准主成分分析、Crosta技术、改进的Crosta技术、软落叶技术、“掩膜/抑制干扰信息+主成分分析”等方法可以有效地提取蚀变异常信息;高植被覆盖区多采用主成分分析生成的蚀变信息主分量进行彩色合成,再通过对彩色影像进行目视解译的方式判断蚀变的类型和范围。其中,“掩膜+Crosta技术”、“掩膜+软落叶技术”、二次主成分分析等方法在高植被覆盖区也可以取得较好的应用效果;对于干扰信息种类众多、岩性复杂的地区,可根据干扰信息、岩性种类划分成若干个小区,再根据每个小区实际情况采用不同的蚀变提取方法,最后将每个小区内提取的蚀变信息进行合并。  相似文献   

不同降维策略下的高光谱影像多特征分类     

杨帆  余旭初  杨其淼  谭熊 《测绘与空间地理信息》2021,44(1):38-42

由于物体表面的空间分布通常是富有规律且局部连续的,在高光谱影像分类中应充分利用其光谱和空间信息。本文在对高光谱影像立方体进行降维处理的基础上,提出了一种联合空域和谱域信息的高光谱影像高效分类方法。首先,分别选用主成分分析(Principal Component Analysis,PCA)和正交投影波段选择(Orthogonal Projection Band Selection,OPBS)两种方法对原始高光谱数据进行预处理,获取降维后的影像数据。然后在其基础上提取扩展形态学特征(Extended Morphology Profiles,EMP)和地物表面纹理特征,组成联合光谱和纹理、形状结构特征。最后,采用支持向量机(Support Vector Machine,SVM)分类器对联合特征进行分类。针对不同真实高光谱数据集的实验结果表明,本文提出的方法运算效率高且具有令人满意的分类性能。  相似文献